Is the "1 dog year = 7 human years" rule accurate?

No — it's a myth. Dogs age much faster in their first two years (each dog year ≈ 10.5 human years), then slow down. Size also matters: large dogs age faster than small dogs.

What is a dog's life stage?

Puppy (under 1 year), Adolescent (1–2 years), Adult (middle aged), Mature (older adult), Senior (final years). Each stage has different health care needs.

Dog Age Calculator — Dog Years to Human Years

Quick answer: Enter your dog's age and size to see equivalent human years, life stage, and estimated life expectancy.

Convert your dog's age to equivalent human years using the American Veterinary Medical Association adapted formula. Results vary by dog size: small dogs age slower than giant breeds.

Last reviewed: April 2026Report an error

Dog's Age (years)

Size

Human Age Equivalent

26 years

A 3-year-old medium dog is roughly 26 in human years. Life stage: Adult.

Human Age Equivalent

26 years

Life Stage

Adult

Life Expectancy

13 years

How to Use This Dog Age Calculator

1Enter your dog's age in years.
2Select dog size: small (<20 lbs), medium (20–50 lbs), large (50–100 lbs), or giant (>100 lbs).
3Read human age equivalent, life stage, and expected lifespan.

Frequently Asked Questions

: No — it's a myth. Dogs age much faster in their first two years (each dog year ≈ 10.5 human years), then slow down. Size also matters: large dogs age faster than small dogs.
: Puppy (under 1 year), Adolescent (1–2 years), Adult (middle aged), Mature (older adult), Senior (final years). Each stage has different health care needs.

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Dog Age Calculator — Dog Years to Human Years

How to Use This Dog Age Calculator

Frequently Asked Questions

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